virtualbox version 5.014 clients do not communicate with each other.

Trying to set up two windows 2012 R2 active directories and one Windows 10 Enterprise as a client. So far I am unable to get any combinations of workstations or servers to intercommunicate with each other. All clients are able to commun icate to and through the host and get Windows Updates. I have tried simplifying to the following:

I have 32 GB or ram and two 256GB SSD. Overall everything is very fast. I have the firewall turned off on all clients.

2 Windows 10 Ent under NAT or under Bridging.
I have also configured the same clients with an additional NIC so both NAT and Bridging are established. No errors, but both Windows 10 system have the same IP address under the Bridging via DHCP. If I change one to a static address again no ping between the two clients. Same exact symptons between the two servers or one server and windows 10.

This is a quick summary of the combinations, but I have systematically worked my way through numerous Virtualbox combinations from the help files and release notes trying this and trying that each time thinking I finally got it figured out. I have gone though a number of SUN based blogs of very similar scenarios by frustrated people.

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First make sure all your VM's have the VirtualBox Additions installed. If you just copied one VM's to another, then your NIC's probably have the same virtual MAC address. That would explain both getting the same IP through DHCP. Change the Virtual MAC address so that every VM has a different MAC address. Use Bridge or Host only mode (not NAT, NAT is only used between the VM and the HOST, and not the VM's).

Normally in VBox, you don't copy the same VM to build a 2nd copy, but rather use "File", "Export Appliance" to create a template of your "Master VM", then import it to create a new VM. That should ensure different MAC addresses as well as ID's for the VM.

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both Windows 10 system have the same IP address under the Bridging via DHCP They must be using the same mac address, remove the network adapter from one machine and add it in. they should get a new ip.

The clients have unqiue mac addresses. During the cloning process this is asked and I check it. I have verified already that the mac addresses for each client are unique. I understand I should use Bridging for client to client.

With Virtualbox cloning are you suggesting the SID is the same on each client?

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I just spent 3 useless hours following my understanding of what y'all are saying and still nothing. I really don't know what I am doing wrong. I may just go back to buying multiple PCs. I know that works. All nics have independent mac addresses. I have tried multiple combos of bridge and host. Again I am trying to get each client to see the outside and each other. I must be tired. Is there step by step approach someone has already gone through. If it is any consolation there are plenty of people pretty stupid trying to set up virtual scenarios similar to mine.

to be visible from the outside you need bridging. Your problems may all be virtualbox related. You're doing things right but something is amiss in your virtualbox installation. What is your host operating system? does your cpu support intel-virtual extensions? You might want to investigate either hyper-v or vmware player or vmware workstation.

I just had one more idea. If I build one virtual 2012R2 system using bridging to get it all patched then clone it with a new mac then change both NICs to host. I tried following the suggestion of exporting/importing , but that took forever so I am using cloning with random mac addresses. I tried vmware player, but it is the slowest app I have ever worked with. Finally you asked about "intel-virtual". Uhh..As stated I have AMD.